Edward, when putting protection on brass be careful as the surface has to be totally free of any moisture which could cause a slow patina due to oxidisation on it under the protection. One way to avoid this is to warm the plates to drive off any moisture before applying the protection. A hair dryer works well for this. I used to put clear lacquer on brass but now leave it polished as it can 'age' to give a good effect or it can be polished back to a shine if required. The copper on the TME was aged with Liver of Sulphur to make it look older. I have used this before on a Steampunk lamp clock as it can give very good aging to pieces and if you scrub parts with fine steel wool you can get even more depth to the finish.
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